Drilling-machine.



E. C. BOWERS L E. 000K.

" DRILLING MACHINE.

APPLIO-ATIQN lFILED OGLB, 1912.

'31,073,322-f- "Patented sept. 16,1913.

` 'l 2 SHEETS-SHEET 1.

di m v E. C. BOWERS & E. 000K.

DRILLING MACHINE.

-APPLICATION IILBD'00T.B, 1912.

Patented Sept. 16, 1913.

/m/e tory Witnesses 1 7h 6%@ www CLUMBIA PLANOURAPH CO., WASHINGTON. D. C-

Y UNITED STATES -PATENT OFFIQE.

ERNEST C. BOWERS AND EUGENE COOK, OF KALAMAZOO, MICHIGAN, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, T0 NATIONAL STANDARD COMPANY, OF NIIIES, MICHIGAN, A CORPORATION OF MICHIGAN.

DRILIJING-MACHIN E.

Specification of Letters Patent.

Patented Sept. 16,1913.

Application led October 8, 1912. Serial No. 724,515.

, and we have shown the same embodied in such a structure, although certain features are desirable and readily adapted for other forms of drilling or boring machines.

The main objects of this invention are, first, to provide in a drilling machine an improved feed mechanism whereby theV drill may be rapidlyT advanced to or retracted from the work. Second, toprovide an improved drilling machine having these advantages, in which the rapid advancing or retract-ing of the drill is effected through the main operating crank. Third, to provide a mechanism having these advantages which automatically releases the feed screw under undue stress, thereby relieving the drill.

Further objects, and objects relating to structural details will definitely appear from the detailed description to follow.

We accomplish the objects of our invention by the devices and means described in the following specification.

The invention is clearly dened and pointed out in the claims.

A structure which is a preferred embodiment of our invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which Figure I is a side elevation of a structure embodying the features of our invention, it being shown in operative relation to a rail, no attempt being made to show the rail in its proper proportions. Fig. II is a detail horizontal section on a line corresponding to line 2 2 of Fig. I. Fig. III is a detail vertical section on a line corresponding to line 3 3 of Fig. II. Fig. IV is a detail view showing the rear end of the too-l holder, the feed screw and the rapid feed dog, the feed screw being shown in longitudinal section and the dog in its disengaged position. Fig. V is a detail section on a line corresponding to line 5 5 of Fig. II, showing the driving cam for the rock. shaft 24. Fig. VI isa detail view partially 1n section on a line correspondingto line 6 6 of Fig. II, showing details of the feed mechanism. Fig. VII is a detail section on a line corresponding to line 7 7 of Fig. VI. Fig. VIII is a detail section on a line corresponding to line 8 8 of Fig. II. Fig. IX is a detail section on a line corresponding to line 9 9 of Fig. I, showing details of a crank.

In the drawing' similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, the frame 1 is provided with a bar-like base 2 disposed toward its rear end. The standard or upright 3 is pivoted to the side members of the frame at 4 to collapse rearwardly upon the frame. The standard or upright is held in its erected` position by the jointed braces 5. The rail hoo-ks 6 are pivoted to rearwardly projecting arms on the lower end of thestandard 3 at 7 so that when the standard is erected stress is put upon the hooks engaged over the rail, at 8. The hooks are provided with a hand piece 9 at their outer ends. This general structure forming j no part of our present invention, is not described with greater detail herein.

The tool holder or spindle 10 is provided with a suitable chuck 11 for the drill 12. The tool holder is supported in a bearing 13 on the forward end of the frame 1 and its rear end projects into the longitudinally bored screw 14. The feed screw and drill holder are connected by the swivel 15. The tool holder is provided with an annular groove 16 which is engaged by the screw 17 on the feed screw, thereby securing the parts together.

The feed nut 18 is arranged in a housing 19 provided therefor formed in the crosspiece 28 at the rear end of the frame 1. See Figs. II and III. This housing is open at the bottom so that the nut may be slipped into the housing from the bottom and the feed screw inserted through the housing and nut. The nut 1S receives the thrust of the feed screw.

The feed wheel 2O is arranged in front of the feed nut and provided with a spline 2l engaging the longitudinal groove 22 in the feed screw. The feed wheel 20 is a double ratchet wheel, it being formed in the structure illustrated, of two ratchet wheels secured together by the rivets 23. The feed wheel is driven through the rock shaft 24 arranged parallel with the tool holder and feed screw, the rock shaft being supported by the bearing pintles 25. The front pint'le of the rock shaft is arranged through the cross piece at thel front of the frame 1, and the rear pintle being arranged through an arm 26 on the cross piece 27 of the frame l.. The feed wheel is arranged between this cross piece 27 and the cross piece 28. This mounting for the rock shaft permits the frame 1 being made an integral casting.

The rock shaft isprovided with an arm 29 having a pivot or stud 30 at its outer end for the outerpawl 3l. The arm 29is provided with a braneh32 having a pivot 33 for the inner pawl 341. The pawls' lie side by side, the inner pawl being retained on its pivot by the outer pawl, the outer pawl being retained by the pin 35.

The tool holder or spindle is driven through the beveled gear 36 splined thereto and the coacting gear 37 on the lower end of the shaft 38 mounted in the standard 3. The gear 37 is thrown into mesh' with the gear 36 when the standard is erected and out of mesh when the standard is collapsed. The gear 36 is provided with a cam 39 which coacts with the forked arm'40 on the rock shaft 24 to oscillate the rock shaft. The gear 36 is held against axial movement by the finger 41 on the rock shaft which projects at the rear of the gear. Either of the pawls may be thrown into operative position and thus vary the feed. VVhen both of the pawls are in operative position as shown in Fig. 1I, the feed is, of course, through the inner pawl 34, the outer pawl being merely an idler. It is however, necessary t0 throw the pawl 34 out of operative position in order to render the pawl 31 operative. The shaft 38 is driven through the crank shaft 42 having a gear 43 thereon meshing with the gear 44 on the upper end of the shaft 38.

The crank shaft 42 is provided with collars 45 having opposed arms 46 thereon slotted at 47V to receive the cranks 48. The cranks 48 are slidably arranged through these slots and are adjustably retained therein by the set screws 49. The collars 45 are permanently secured to the crank shaft by the pins 50. Theinner ends of the collars bear against the side members of the upright 3 thereby securing the crank shaft against longitudinal movement. The further advantages of this crank structure are economy of manufacture, thenecessity for squaring the ends of the crank shaft and breaching the crank being overcome, the

cranks are adjustable, and inshipping may be reversedvso that its hand piece 51V projects inwardly, thus rendering the structure more compact. By providing the collar with opposed arms 46, it may be made co-mparatively light as the stresses are equally distributed. Y Y

To quickly advance the drill to or retract it from the work, we provide a dog or clutch member 52 which is arrangedwithin the feed screw. The rear end of the tool holder 10 is notched at 53 to .provide jaws coacting with the clutch do-g. Thisnotch is prefer-V ably curved as shown, the engaging portion of the clutch member being curved or rounded, they object of Vwhich will appear as the description proceeds. The member 52 is pro-vided with a stem or shank 54 having a head 55 at its outer end, the head having a driving tang 56 adapted tov coact with a transverse jaw slot 57 in the rear end of the feed screw, the driving tang being adapted Y.

to engage when the member' 52 is in engagement with the tool holder, itbeing shown in engagement in lfigs'. H and 111, and out of Yengagement in Fig. 1V. The member 52 is held yieldingly in its `engaging position by the coiled spring 58 arranged within the feed lscrew `as shown in Figs. 111 and IV.

The clutch member is held out of its engag-l ing position by turning the driving tang 56 transversely of the jaw slot 57. The-headV .is preferably knurled to? betterY serve as a finger piece. When the clutch member iisdisengaged and the drill holder is rotated, the feed screw is operated with a step'by Step movement t@ advance the drill by' means of the feed wheel. j v p Vhen it is desired to rapidly advance the drill to or `retract it fromA the work, the

clutch member is engaged and on the rota-` drill being driven against the workwith the clutch member in engagement, the engaging jaws 'of the tool holder and the clutch member are rounded so that they disengage under this undue stress, releasing the feedy screw and thus stopping the feed. By this simple arrangement we provide means whereby the rapid advancing or retracting of theA drill is secured, the same being operated through the main operating crank of the machine. rThe clutch is quickly and easily engaged or disengaged so that veryl rapid manipulation is possible.

l/Ve have illustrated and described 'ourj improvements in detail in the vform in which We have not we have embodied the same. attempted to ilhistrate or describe various modifications Awhich we contemplate as such modifications or variations in structural details will be readily understood by those skilled in the art to which this invention relates, from the disclosure made. We

desire, however, to be understood as claiming our improvements specifically in the form illust-rated as well as broadly within the scope of the appended claims.

Having thus described our invention, what we claim is new and desire to secure by Letters Patent is:

l. In a drilling machine, the combination of a tool holder; a feed screw therefor having a longitudinal bore therein into which the rear end of the tool holder projects, there being a transverse curved notch in the rear end of said tool holder and a transverse notch in the rear end of said screw; a swivel connection for said tool holder and feed screw; .a fixed feed nut for said feed screw; a feed wheel splined upon said feed screw; driving connections for said feed wheel and tool holder, said driving connections being adapted to be disengagedfrom said feed wheel; a clutch'member for securing said feed screw to said tool holder arranged within said feed screw and provided with a rounded tool holder engaging portion at its inner end and with a head at its outerend having a driving tang thereon adapted to engage said notch in the rear end of said screw; and a spring arranged within said screw for yieldingly supporting said clutch member in its engaging position, said clutch member being held out of its engaging position by turning the tang thereof transversely of the said notch in the rear end of the screw.

2. In a drilling machine, the combination of a tool holder; a feed screw therefor hav ing a longitudinal bore therein into which the rear end of the tool holder projects, there being a notch in the rear end of said tool holder and a notch in the rear end of said screw; a swivel connection for said tool holder and feed screw; a fixed feed nut for said feed screw; afeed wheel splined upon said feed screw; driving connections for said feed wheel and tool holder, said driv-r ing connections being adapted to be disengaged from said feed wheel; and a clutch member for securing said feed screw to said tool holder arranged within said feed screw and provided with a tool holder engaging portion at its inner end and with a driving tang adapted to engage said notch in the rear end of said screw.

3. In a drilling machine, the combination of a tool holder; a feed screw therefor, there being a transverse curved notch in the rear end of said tool holder and a transverse notch in the rear end of said screw; a swivel connection for said tool holder and feed screw; driving means for said feed screw and tool holder, the driving means for the feed screw being adapted to be dis* engaged; a clutch member for securing said feed screw to said tool holder arranged within said feed screw and provided with a rounded tool holder engaging portion at its inner end with a driving tang at its outer adapted to engage said notch in the rear end of said screw; and a spring arranged within said screw for yieldingly supporting said clutch member in its engaging position, said clutch member being held out of its engaging posit-ion by turning the driving tang thereof transversely of the said notch in the rear end of the screw.

4. In a drilling machine, the combination of a tool holder; a feed screw therefor, there being a transverse notch in the rear end of said tool holder and a transverse notch in theV rear end of said screw; a swivel connection for said tool and feed screw; driving means for said feed screw and tool holder the driving means for the feed screw being` adapted to be disengaged; a clutch member for securing said feed screw to said tool holder arranged within said feed screw and provided with a tool holder engaging portion at its inner end with a driving tang at its outer adapted to engage said notch in the rear end of said screw.

5. In a drilling machine, the combination of a tool holder; a feed screw therefor; a swivel connection for said tool holder and feed screw; a fixed feed nut for said feed screw; a feed wheel splined upon said feed screw; driving means for said feed wheel and too-l holder, said driving means being adapted to be disengaged from said feed wheel; a clutch member for securing said feed screw to said tool holder arranged longitudinally within said feed screw; and a spring for yieldingly supporting said clutch member in its engaging position.

(i. In a drilling machine, the combination of a tool holder; a feed screw therefor; a swivel connection for said tool holder and feed screw; driving means for said feed screw and tool holder; a clutch member arranged for longitudinal adjustment within said feed screw, said tool holder and feed screw having jaws adapted to coact with said clutch member.

7. In a drilling machine, the combination of a tool holder; a feed screw therefor; a swivel connection for said tool holder and feed screw; a fixed feed nut for said feed screw; a feed wheel splined upon said feed screw; driving means for said feed wheel and tool holder, said driving means being adapted to be disengaged from said feed wheel; and means for securing said feed screw to said tool holder so that it is rotated therewith. j

8. In a drilling machine, the combination of a tool holder; a feed screw therefor; a swivel connection fo-r said tool holder and feed screw; driving means for said feed screw *and :tool Lholder; -a clutch member for connecting said feed screw and tool holder to rotate together.; and a spring for yieldingly. supporting said-clutch member in its engaging position whereby it is permitted to disengage under excessive stress.

9. Iln a drilling machine, ythe combination of a tool holder; a feed screw therefor; a swivel connection lfor said tool holder vand feed screw; driving means for said screw and tool holder; and disconnectible means for securing said feed screw to said tool holder so that it is driven therewith, all coacting for the .purpose specified.

l0. In a drilling machinathecombination With the frame, of a tool holder; means for driving said tool holder; a feed screw; a double ratchet feed Wheel;-a pair of coacting pa-Wls; a rock vshaft journ'aled in said frame and driven with said tool holder; and an offset paWl carrying arm on said rock shaft provided With apivot at its end ffor the outer pawl and with a branch having a pivot at its end for the inner paWl whereby the gpawls are pivotally supported at different distances from the axial center of the rock shaft .and have different strokes, the

Copies 'of this patent'may Abe btane'dfor ive cents each, by addressing the Washington, 2D.y C.

novae-2 inner pavvl being retained on its pivot by the outer,1the outer `being retained by a pin.

11. In .a drilling machine, the combination with the collapsible lframe, of a .tool holder on the base portion of the frame', a feed screw, a ratchet `feed Wheel for said screw, a tool holder gear providedv with `a cam splined to said tool holder, Va driving gear said frame and adapted to swing aivayfroin lapsed, a rock sha-ft journaled in said `frame and provided With a" forked farm coacting thev driving gear is swung :away therefrom, and a. tool on; said rock shaftcoacting `With said feed 'iv-heel.

In Witness Whereof;"wefhave hereunto set our .hands and seals `in the fpresence of two Witnesses.`

ERNEST C BONVERS. EUGENE Witnesses: Y

M. Pi-IINAVVooDRUrr, PEARL E. LILLrEi [Li s] [11.V sf] Commissioner of 'atents;

said tool holder gear vWhenthe frame is colV with said cam and withzafinger disposed to i retain safely-tool holder gear in posit-1011 when therefor carried by the movable portionof Y 

